Just grease everything that moves... it will prolong the life anyway and have the side effect of fixing the squeak.
Wheels - bearings, axles
Drive - pulleys, check transmission
Deck - anti skid wheels, pulleys, spindles
Seat - springs and hinge
Stearing - wheel, rod, control arms
Engine - engine oil, starter etc.
Hood - bouncing, hinge
Belts - not to tight, not to loose
Like I said anything that moves creates friction a little grease (my favorite is the white lithium grease spray) makes friction not wear parts I'm sure you will find it if you listen careful