it depends on what type of chemicals or materials the stain contains. nail polish remover is a very powerful chemical remover but, does take off stains very well. if i know whet the stain is made...
White residue on faucets and shower heads most likely are from the hard water mineral deposits that your water contains. Sometimes, the residue is from cleaning products, but most often not. To help...
when your kitchen sink gurgles, that means that there is a restriction of flow, aka a stoppage. it is best to run a cable down the line. you may want to try a non-toxic baterial enzyme, like...