The BEST way to clean them is to take them out and have a shop or someone with a injector cleaner clean them for you. Then you can have the spray pattern and the pop off pressure checked. We use redline injector cleaner in our injector cleaner. HTH! Dave -- Email problems to: scirocco-l-probs@scirocco.org To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org