We recently had our septic tank pumped out(1st time in 30+ years) and I asked about using Rid-X. Was advised to put a pkg of regular yeast in and it would do the trick.
I have washed and dried rag quilts at home before, but will definitely go to the laundromat for the next ones. BTW if you dry them at home empty the lint filter often, you will be surprised how fast it fills up with just one rag quilt.