Quick answer: The stain remover dry cleaners use is really a set of spotters, one for each stain family: protein (sweat, blood), ink and paint, oil, rust, grease-bound dirt and food colour. They differ by chemistry, enzymatic, solvent-based, acidic or alkaline, because the stain families need opposite treatments. The spotter is applied on a spotting board, worked mechanically, flushed, and then the garment is cleaned as normal.
The six stain families a stain remover dry cleaners use must cover
Almost every stain that reaches a counter belongs to one of six families, and the family decides the chemistry, not the garment or the customer's story.
- Protein: sweat, blood, milk, egg, body soil on collars. Water-based, sets with heat.
- Ink, paint and adhesive: ballpoint, marker, emulsion paint, sticker glue. Held together by a binder that water will not touch.
- Oil: cooking oil, hair oil, cosmetic oil, machine oil. Not water-soluble and often invisible until the garment is pressed.
- Rust: iron marks from hangers, buckles, water tanks and metal furniture. An oxide, not a soil, so no detergent moves it.
- Grease-bound dirt: the grey ring on cuffs, pockets and collars where dust has been glued down by body grease or road grime.
- Food and food colour: curry, turmeric, tea, coffee, juice, sauces, sweets. A mix of tannin, dye and oil, usually needing more than one pass.
How spotters differ by chemistry
Four chemistries cover the six families. Knowing which bottle is which is what separates a spotter from someone rubbing at a mark.
- Enzymatic: enzymes break protein into fragments small enough to rinse away. Works slowly, likes warm (not hot) conditions, and is wasted on anything that is not protein.
- Solvent-based: dissolves the binder in ink, paint, adhesive and oil so it can be flushed out. Fast, but it can move dye and plastic prints, so it is always tested on a seam first.
- Acidic: converts rust and other metal marks into a soluble form. Must be rinsed out completely, because acid left in cotton weakens the fibre over time.
- Alkaline: saponifies grease and lifts the dirt it is holding. The general-purpose chemistry for grease-bound soil and many food stains, but too strong for silk and wool at full strength.
Mixing chemistries on one stain, or using them in the wrong order, is how a removable stain becomes a permanent one. Acid after alkali on a food stain, for instance, can set the tannin.
The spotting-board kit
The board itself, with its steam gun, air gun and vacuum nozzle, does half the work. Around it a working dry cleaner keeps:
- Six labelled spotter bottles with drop or dauber tops, one per family.
- A bone spatula or smooth-edged spotting tool for working the chemical in without abrading the fibre.
- A soft spotting brush for heavier fabrics.
- White cotton blotting cloths and a stack of clean towels.
- A small bottle of plain water and a neutral rinse for flushing.
- A notebook or whiteboard for recording what was tried on garments that need a second pass.
Everything on this list except the board is cheap. The cost of a spotting station is almost entirely the board, which is why the guide to starting a dry cleaning business in India treats it as a day-one purchase.
Order of attack
- Identify the family. Look, smell, ask the customer, and feel the edge of the stain. A stiff edge usually means protein or adhesive; a halo means oil.
- Test on a hidden seam. A drop of the chosen spotter inside the hem, wait a minute, blot with white cloth. Any dye on the cloth means stop.
- Work from the outside in. Apply the spotter to the edge of the stain first so it does not spread, then move to the centre.
- Use mechanical action gently. Tap with the spatula or brush; do not scrub. Steam from the gun lifts most of the work.
- Flush completely. Rinse through with water or neutral rinse and vacuum dry. Chemical left in the cloth will mark on pressing.
- Clean as normal. Run the garment through the machine or wet cleaning cycle, then check again. Only now post-spot what remains, using the next chemistry in the chain.
Water-based stains must be handled before the cycle, because the heat of drying sets them. Oil and grease often come out in the solvent and only need post-spotting if a mark survives. For a deeper walk through the hardest families, see the guides on removing ink stains professionally and removing rust stains the trade way.
Matching each family to a Purolix spotter
The Purolix spotting system was built so that the family and the bottle have the same name, which makes the board easy to teach to new staff.
- Protein (sweat, blood): Spot Sweat. For collar rings that have built up over months, the collar sweat stain guide adds a pre-wash step.
- Ink, paint, adhesive: Spot Ink.
- Oil: Spot Oil, covered in detail in the oil and grease stain guide.
- Rust and metal marks: Spot Rust.
- Grease-bound dirt: Spot Grease. For the everyday collar and cuff ring that has not yet set, the Collar & Cuff 500 pre-spotter at the sorting table is the cheaper first move.
- Food and food colour: Spot Food, with the food stain guide for turmeric and curry.
All six are sold per kg, with prices published and GST stated separately. Dilution ratios ship with each product; the guide to laundry chemical dosing explains how to keep them consistent across staff.
When to hand it to a spotter
Not every mark is worth the risk at the counter. Silk, wool crepe, beaded or sequinned garments, anything with a printed or flocked surface, and any stain that has already been attacked at home with an unknown product should go straight to the most experienced spotter in the store, or back to the customer with an honest explanation. The six Purolix spotters are on the price list, and if a stain on the board is not responding, send a photo and the garment label through the contact page and we will suggest the next chemistry to try.
Why do dry cleaners not use one all-purpose stain remover?
Because the six stain families need opposite chemistries. Rust needs an acid, sweat needs an alkali or an enzyme, ink needs a solvent. A single product strong enough to do all three would damage most fabrics, so the trade uses one spotter per family.
Should a stain be spotted before or after the machine cycle?
Before, wherever possible. Water-based stains such as sweat, blood and food colour can set with the heat of the drying cycle. Pre-spot, flush, then run the garment; post-spot only what the cycle left behind.
How do you know if a spotter is safe on a particular garment?
Test it on a hidden seam allowance or inside hem first, wait a minute, blot with a white cloth and check for dye transfer or texture change. If anything moves, stop and hand the garment to a senior spotter.