Use hot water. Most caustic cleaners are formulated for hot water(160-170f)and will foam when cold, and not clean as well. Also if you have heavy Kausen rings, a ricirculation of hot water for only 5 mins will take a lot of the cake off, dump and do your caustic cycle. Adding acid @ 1oz/gl like some mentioned will help too, but jusat water does alot. If you want o use colder water try a clorinated caustic like 5-star super CIP @ 120-140f, but that demands an acid cyle every time.
Brewmaster, Figer's Brewhouse
"Your results may vary"