Here is the real world test results of various Car care products available in Indian Market.

BEST DASHBOARD POLISH - STP - Sun of Gun
Tried: 3M, AbelAuto, Waxpol, ArmorAll, MotoMax, Sonax, Vista, Eagle One

BEST RUBBER POLISH 3M
Tried: Waxpol, MotoMax, 3M, STP (Recommended)

BEST WAX - Meguiar's NXT
Tried: 3M, TurtleWax (Recommended), Armor-All, Eagle One, Waxpol, Sonax

BEST CAR POLISH - NUFINISH
Tried: 3M, Kangaroo, Waxpol, TurtleWax, Sonax, Meguiar's

BEST GLASS CLEANER - Colgate Toothpaste
Tried: Vista, 3M(Good for Internal use), Sonax, AbelAuto, Waxpol(Good for Highway use), Cyclo

BEST LEATHER CLEANER - Leather CPR
Tried: 3M, Meguiar's, LEXOL, AbelAuto, STP Tuff Stuff, ArmorAll, Stanley, Mr. Leather, Amway(Good conditioner), MOTOMAX (don't try this on pure leather)

BEST CAR WASH SHAMPOO - SONAX (Orange, not Gloss Shampoo)
Tired: 3M, MotoMax, Amway, Wurth

BEST WHEEL CLEANER - TURTLE WAX F2-21
Tried: AbelAuto, SONAX, Renew, Armor All, ABRO, Gulf

BEST ROOF/TRIM CLEANER - CYCLO MAXCLEAN
Tried: ARMOR ALL, STP TuffStuff, MOTOMAX, SONAX INTERIOR CLEANER(Good Spot/Ink Remover), PowerHouse

BEST ENGINE CLEANER - LA's Auto Degreaser
Tried: PRIL Degreaer, Rustolene, Wurth, 3M, MOBY, Castrol SuperClean(not available now)

BEST RUBBING COMPOUND - WURTH
Tried: 3M, Waxpol, MotoMax

BEST SCRATCH REMOVER - QUIXX
Tried: 3M, Waxpol, MotoMax, MEGUIAR's, Sonax

BEST TAR REMOVER - Goo-Gone
Tried: ECClean, La's, WD40

BEST PENETRANT - PB Blaster
Tried: WD-40, 3M, Wurth

BEST ANTI-CORROSIVE - ACF-50
Tried: WY-50, TriboCor, Wurth

BEST WINDSHIELD CONCENTRATE: WAXPOL
Tried: Sonax, AeroShot, Wurth

Warning: The above results are just from our personal experience on a single vehicle and should NOT be considered as a lab test. Trust our results at your own Risk!!!

Note: I will update this post regularly.