l have a 1994 Lexus ES300. and l am trying to pop the plastic grille off to replace the 6x9 speakers. but l can not get it off. is there some sort of trick or something???

no. the factory ones are good

I've had two Lexus LS400s, a1991 with 60000 miles, which l traded for a '98 which has 98000 miles. never any trouble with either sound system.
Suggest letting a pro handle the speaker problems, though.

Honey if you do not know what you're doing.then take it to the pro..try to save a few bucks may get you ended up replace the new deck..

You have to remove the whole panel to remove the 6 x 9's. Start with removing the 3rd brake light. Get in the back seat and pull panel toward you, pull hard feels like you might break it. Very hard to remove for some reason? Remove screws afterwards. Go to a Lexus forum (Club Lexus or Lexus Owners Club) they will give you detailed DY l instructions on how to remove with pictures.