To clean the MAF wires on the FZJ80 best IME to remove the MAF from the engine then with it in your hand look into the MAF housing from the downwind/engine side and you'll see the wires inside a central hub. Using CRC MAF cleaner you spray directly onto the wires but don't touch/push on them...
Assuming you're working on a FZJ80?
Make sure of course that the groove for the gasket is completely clean, no left over bits of the old gasket stuck in there. Adding a small dab of FIPG in the groove at the corners before installing the gasket won't hurt, don't use too much, you don't want it...