QUOTE(IMBeta305 @ Oct 9 2018, 11:03 AM)
if i leave it that long, wouldn't the wax get hardened, end up more difficult to remove?
Some part of my MF towel already got that hardened wax.

QUOTE(blurcase @ Oct 9 2018, 11:11 AM)
The wax would harden, but shouldnt be to the point cannot remove from towel.
Perhaps u could try rinsing it in a small pail of diluted IPA and see if it comes out.
I recommend soaking it in fabric detergent before giving it another wash in the washing machine.
Diluted IPA actually doesn't do much in removing wax on microfiber and in fact, doesn't remove wax on car panels entirely as well. (It may remove some, but not entirely)
IPA function as "solvents and viscosity decreasing agents", basically just help to lift things to the surface. M/f is good at "catching" particles thanks to the microscopic fingers (split fibers). So issue with removing dry wax on m/f is that sometimes, some form of agitation is required to remove it from these fibers
I usually just take 2 m/f and rub it against each other after soaking for a night in the soap bucket, followed up by fresh detergent and machine wash.
Detergent in liquid form is fine on microfiber towels. Softeners are fine on m/f towels too despite what people would say. Just use a little than the regular amount you would on wearables. I've personally tested it. M/f that is added with softeners on final rinse (with small amount) doesn't do any harm on paint. The issue with too much softeners is that is would clog the split fibers and making the m/f hard to "catch" unwanted particles like dust on panels or surfaces.
If you have used a m/f straight from the packaging, chances are you have used a softened m/f on surfaces before. These m/f are soft and fluffy initially and subsequently feels rougher after a few washes. This is because prior to delivery, m/f clothes are washed and softened in factory before shelving to make it more sellable. Nobody will want to buy hard and rough clothes.
Softeners will be washed out after several washes with detergent. Softeners are hydrophobic, to check if your m/f contains softners, just drip a drop of water on it, old m/f would immediately absorb it while softened (brand new from packaging) clothes would take some time. You would see beading on it.