I have a graveyard of towels in the back of my linen closet. Perfectly good towels, washed a hundred times, that still smell musty twenty minutes after you dry off with one. The pillowcases went the same way, and the ones on my husband's side had gone a dull yellowish color at the top. I'd done everything you're supposed to do — washed on hot, added vinegar, tried an enzyme detergent, tried an oxygen booster, tried those scent beads — and the smell just came back. After a couple of years of that, a towel got demoted to the dog, or the garage, or the bin.
Then I saw an ad and tried this combination.
An ad for White Hack came up. The pitch was that regular detergent doesn't actually get out what makes towels smell — it's sweat, body oils and skin residue held deep in the loops of the fabric, and the fillers and coating agents in a lot of detergents leave a film on top that holds the smell in. And here's the part I hadn't heard before: you need both things in the same wash. Enzymes to break the buildup down, and an oxygen booster to lift it out. One without the other only does half the job — which, looking back, is exactly what I'd been getting. So it comes as a pair: the detergent is a thin sheet, the booster is a tablet, and they're made to go in together. No jug, no cap, no scoop. Under $60 for the two, with a money-back guarantee. I figured if it didn't work, I'd send it back and buy new towels like I always do.
I followed the soak instructions in the little booklet: one booster tablet dissolved in a basin of warm water, the worst towels and both pillowcases in, left for an hour.
The water went grey. Not a little cloudy — grey. That was the sweat, the body oils, the skin, the softener, the stuff two years of wash cycles had apparently been leaving in there.
The smell came out.
I wrung them out and ran them through a normal warm wash with one sheet and one tablet in the drum — the pair together, the way the booklet says. They came out smelling of nothing. Not of perfume — of nothing. Which, with towels, is exactly what you want.
I'd tried enzymes. I'd tried oxygen. It was the two together that finally did it.
Now I use the two together for everything.
One sheet and one tablet go into every load now — always as a pair, and not just for towels. Sheets, pillowcases, my gardening things, my husband's undershirts, the dog's blanket. The box is light enough to carry in one hand and there's nothing to measure or pour. I'm sixty-eight and I do not miss lugging a jug of detergent up the basement stairs. It's the simplest thing in my laundry room, and it's the one that actually works.
One honest note: this is two products, not one, and they're meant to be used together. The sheet is the detergent, the tablet is the booster. I tried a load with just the sheet once to see — it was fine, but it wasn't this. For towels and bedding that have smelled for years like mine, the soak is what made the difference — a single wash wouldn't have pulled out that much buildup. And it's for cotton, linen and synthetics; my wool and silk still get washed by hand, the way the care labels say.
White Hack + Booster Hack — Takes out the odor and stains in a single wash

The detergent sheet and the booster tablet, sold as the pair they're meant to be used as. One sheet and one tablet per load. No jug, no measuring. Unscented option available. 120 loads per kit. Free shipping, 30-day money-back guarantee.
$147 $59 — Try the pair risk-free →If you've got a shelf of towels you've stopped trusting — get the two together and try the soak first. Under $60 for the pair, and if it doesn't work you get your money back. Worst case you buy new towels, like you were going to anyway.