Having trouble removing the spark plugs since they are in so deep. Any hints? on 1994 Mercury Cougar

I'm using extensions and have done hundreds on tune ups, but these dang plugs never seem to loosen to be removed.
The plug holes are so deep so you only see the tip of the plugs by leaning very far over the engine. It's my daughters car a 1994 Mercury Cougar V8.

Asked by for the 1994 Mercury Cougar
1 answer
Spray some PB buster or some other penetrating oil into the holes and let it sit overnight. Should be easier the next day.