You are correct. The bonds created need to be broken, but it's pretty
easy to do. Acid.
Luckily, every has the right acid available - acetic acid. That's
right, good ol' vinegar. Take your recipe from above, substitute
white vinegar for the ammonia, and liberally slather it onto your
windshield. Do it in the shade, BTW. Hose it off and use Windex or
whatevewr to finish it up.
Learned it as a teenager working at the local carwash. It works great, but
as others have warned - don't expect it to cut through everything...
This is the topic of enormous discussion in this group and elsewhere. I'll
give you the short version, and let you research the details:
Ignore factory recommendations and replace the T-belt before 70K miles.
A t-belt failure on these interference engines means 20 or 30 bent valves.
Just do it.
If you have a V6, replace the water-pump at the same time - it can leak on
the tensioner and cause a cascading failure.
If you have a 1.8T, don't let the mechanic talk you into a water-pump
(unless you really suspect it's failing). It's on the other side of the
engine from the t-belt.
Expect to pay ~$750 or so for parts and labor.
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