Originally Posted by Boy
...I only use hot water and oxi-clean for cleaning and sanitize thoroughly.
You might want to add Star-san to your sanitation protocol. Oxi-clean is good for cleaning and breaking apart soiled organic material. Star-san is designed to sanitize food prep areas.
You should try to track down where your problem is too. A good method for determining where your contamination is coming from is to save some wort in a sanitized jar and cover it with foil (don't pitch any yeast into it). set it next to your fermenter. If you don't
see any activity for a week you process post boil is good, and your problem was with your fermenter, or how you are pitching your yeast. If you see activity in the jar in less than a week you have a problem with you post boil practice. i.e. cooling and transferring.