Seriously??? Sorry Matt but I've just gotta say NO to your advice.
Oven cleaner is liquid lye, the last thing you really want dripping on you when you're under a car. It won't only discolor and adversely affect anything aluminum, it will also eat through paint (and thereafter invite more rust) AND any plastic you're using to protect other parts ... and probably trash your driveway / garage flooring if you leave it on there for too long.
Sherry, just get some industrial strength cleaner like Awesome, Purple Power or Mean Green, a big scrub brush and a plastic scraper for the tough road grime. It's a lot of work but once everything is clean you'll easily find any leaks. And leave the oven cleaner for your kitchen and anodizing removal. Just my two cents' worth ...
Leanna
i should have been clearer about it, dont get underneath the car with the the oven cleaner. maybe jack the car up in the driveway, and put it on stands, then spray it all down underneath, let it sit awhile, then hose it off with a strong stream of water, or better yet a power washer. i forgot to recommend using goggles, and rubber gloves, but if your cleaning your oven you would use these anyway right? you would still take these same precautions if using it to degrease your engine.
i have used this stuff numerous times on different cars engines, never had it mess up paint on older paint jobs, or ever had it damage any rubber or plastic parts. of course i dont purposely spray it on a cars fenders, just the engine, and K frame, and lower frame rails if grungy.
yes it will discolor aluminum as it is caustic. and may screw up blacktop, never had it mess up my concrete driveway tho. if you are going to clean the engine you wouldent doing this method in your garage anyways as you have to rinse it off with water to neutralize the oven cleaner.
i stand by this, i have cleaned many different engines and K frames this way, its fast, and cheap, never had it strip any engine compartment or body paint, im sure it will strip wax off the paint tho, and it doesnt leave any oily residue. castrol super clean, or purple power clean is great too, it is also caustic to aluminum parts as well.
if in doubt about your fenders , cowl, and hood, tape em off with plastic sheeting to keep the water and oven cleaner off them while cleaning it up.
to each their own, but this works for me.
just my .02
matt