Had to wash some bottles/get the labels off for a bottling run, so I filled a largish cooler with warm water, added a scoop of Oxyclean free and dunked the bottles in. I let it sit overnight. The next morning the labels came off easily but there was a gritty residue both inside and outside the bottles.
Anyone else experience this? Is this due to too much/too little Oxyclean? Is hard water a contributor?