While this is a very opinion oriented topic, there are some things that are fact with MF's. Regular detergents, even he types, will require extra rinse in warm water to break down and completely rinse free from mf's. Yes MF's wear just like anything else, but if cared for properly they will last years. I have some that I bought from wally world probably about seven years ago now, and I have just start throwing them out due to use on greasy things. I have a Microtech brand drying towel that is about 7 years old and until recently has been lint free/foam free; an old orange pad and the internal sponge of a chenille wash sponge got mixed into the wash. IMO those wally's MF's and several AG MF's(that are 6yrs old) have last because I have used mostly mf detergent with them. I recently started using DP's MF detergent have been impressed with how well it brought my original WWMF drying towels back to life(6 yrs old). If you ever smell the scent of the detergent that you used to clean your MF's/clothes/anything, that means that there is still particles of detergent in the fabric/material. This means that the detergent can be trapping dirt in the fibers as well as scent and the MF will not be as clean, nor soft. I also started using vinegar in my fabric softener dispenser on my HE front-load washer, and it has resulted in even softer MF's.
You would hope that sealants are not water soluble, otherwise it would was off your paint in the rain even when cured. It takes a good soaking in MF detergent to dissolve sealants/waxes/grease/oils out of MF's and pads. I use MF detergent with my pads and have great results, if not better than with pad specific detergent. I have found that a little scrubbing gets the sealant/wax off pads well, followed by a warm rinsing after soaking. Like getting anything else that is dirty, clean, you have to scrub a sometimes. Think off what we put MF's/pads/applicator through, and then we expect them to just magically come clean after a 15min soak and a quick turn/spin in the washer; and with the same detergent we use to wash our everyday clothes?... Soaking is your friend to get really clean MF's! Even MF specific detergent is recommended on regular cotton towels to get them even cleaner and softer w/o fabric softener. They make detergents for synthetic sportswear, and if you have ever smelt sportswear after washing with a regular detergent(especially sudsing kinds) you will know that the detergent and B.O. didn't rinse out. Use the right tool for the right job is all I am saying I guess; unless you want to go back and do the job over again.