Most engine degreasers are intended to work at higher temperatures. I haven't had very good luck with spray degreaser, but obviously my experience contradicts that of others in this thread. I prefer citrus-based, non-hazardous degreasers. I find they do just as well as the engine cleaners (better in most of my cases) and cost a lot less. I agree with the posters who say that rinsing with a hose is not going to damage anything.