FWIW, I bud wash damn near all of my plants and I use hot tap water, whereas my tap water is set to 120F (about 45-50C), and I have yet to loose trichs, potency or bag appeal.. I only use the hot step on the first rinse.. Second rinse is cold COLD water.. I almost feel as if too cold is worse than too hot as the cold causes the trichs to become fragile and break off (READ: ice hash).. As long as it's not too hot for your hand to handle, your buds should be fine. Just don't be too abrasive with them while you're dunking and swishing.