Hi everyone. I have a maxum 27 scr that has a 454/ 4 barrel carb. Engine hours are 380 and runs well. My question is about fuel additives ie: carberator cleaners. Do they work? Are they ok to use ? What brand if they are? I use a spray cleaner for external cleaning and the spark arrestor. Everyone on this site has been very helpfull with my other questions and I thank all in advance.