Buy a sponge/foam, it will cost Rs. 10, similar to -
Apply small amount of VIM Dish Wash Liquid on wet foam -
Go for lemon flavor, its fragrance will make car smell clean too!
Now scrub fabric/plastic (door pads etc), keep soft towel and water basket close, don't let solution dry too much, 2-3 mins is enough, clean one section at a time, then clean wipe with wet towel. Please find shady and cool area for this or solution will dry too quick, its effectiveness will reduce if you try to clean hot interiors.
Now park car in sunlight with windows rolled down for 30 mins.