Product review (5 stars): I find that washing 4-5 towels at a time works best. I've also found that powder detergent works best
I have 2 of these (in different places) and use them daily.  I find that washing 4-5 towels at a time works best.  I've also found that powder detergent works best, but that's just me.  I've been using mine several times a day for several months and they still work great!