my vits engine is very dirty, i want to wash.
Can u suggest any liquid for the same?

 

Engine de-greaser, break cleaner, or just soap and water. Just be careful of the electronics and if you have a lot of oil build up on your motor, it may be leaking, so check for any leaks once it is clean.

 

I have had great luck using the GUNK brand products. They have different levels of products based on the severity of the dirt/grease/oil that needs to be removed. Check them out, they even have a "Shine" step that will put a nice glossy wet look over your engine bay (obviously don't shoot it at your belts...)