Why anyone would wash old dirty, greasy rags in their home washing machine is beyond me.
Agreed. I have several pairs of Dickies work pants and work shirts I used to wear when I worked in a shop. I still wear those when I work on cars at home. But I also wash those separately from anything else, other than maybe bath towels. I'm not putting dirty shop rags in my washing machine, or mixing dirty work clothes with my regular clothes.
In a shop environment you're going to have a cleaning service that will take dirty uniforms and rags, and replace them with clean ones every week. But at home, not so much. Once the shop rags are wet or otherwise soaked with oil or some other automotive fluid, they get thrown away. If they are dirty but dry, I keep them around until I need to clean up something wet.
At home, it's just me. I'm not running a shop with multiple people several hours a day 5 to 7 days a week. A new bag of 50 rags will last for months. I've been buying the HF rags for years. They are $10 for a 50 pack regular price and I always have a new unopened pack on hand. When I get low or open that sealed pack, I buy another. I might buy 1, maybe 2 packs, a year.
I also keep disposable shop towels and pig mats, etc. on hand as well. But for me, rag or not, it's all consumable.
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