While there are other methods of making soap (hot process and melt & pour), this soap making 101 tutorial provides a basic overview on how to make soap the cold process way. It will be added to my Natural Soap Making page along with other helpful link

Lavaggio Fai-Da-Te per cani!!!.

Acid washing, also known as acid etching, prepares a concrete surface to accept a sealer. You can also use acid in weaker concentrations to remove white mineral deposits (efflorescence) and heavy grime.