Do you have the ability to garage the car? Even in PA that can be a problem with the sun.
As far as products go, since I signed up on this forum in 2009, I was introduced to Adam's Polishes. I tried them and never looked back....still make my annual purchase. I love their leather and interior cleaner. I use it all the time. Then, once a year I will use their leather conditioner for the small amount of actual leather we have. It doesn't take long or use much product. So while pretty expensive, a lot of their products go along way for me.
Current: 2009.5 SBM G8 GT, Premium Package, Sunroof, Pat G. ECM/TCM Tune, Roto-Fab 102mm CAI, LS7/LS3 MAF, Kooks 1 7/8" LT's, SOLO HFC's, SOLO Mach-Shorty Balanced Catback, SOLO 3.5" Tips, 19" Sport Package Wheels, GXP Steering Wheel, GXP Diffuser, Neondials, VG Sharkfin II, Debadged (Except Arrowheads), Hood-Vent Mod, Lower Grille Mod
Next: RCR Modified Intake Manifold, RCR Ported TB, Powerbond UDP, Suspension Upgrades