Awan sb
finishing waxes comes best on prep surface , prep surface means claying / polishing
further more whites require more cleansing than rest of paints as it become pale faster, once a year claying process is very healthy for car skin , clay remove all contaminations without damaging the clear coat , enhance color and give best bondable surface for wax
OR OTHER OPTION IS
cleaner wax , meguiars cleaner wax is very nice , economical , quick solution
once in 2 months apply a coat of cleaner wax than topup with ultimate wax
this combo is "fair & lovely" for white cars specially however u can use this combo on any color.
About wet and rich looks on interior
clean surface with apc than apply meguiars hyper dressing 2:1 ratio or Chemical Guys Silk dressing , both will bring this outcomes Inshallah