Clean walls are essential for good paint adhesion. Dust, grease and old cobwebs create a thin barrier between the wall and the new paint. If you don’t remove them, the paint may not stick properly, leading to peeling, bubbling or uneven patches later.
Kitchen walls especially can have an invisible film of oil or fumes, even away from the stove. Bathrooms may have residue from moisture. Simply rolling paint over all that traps dirt in place and weakens the finish.
A quick wipe with a damp cloth (and mild detergent in greasy areas), followed by letting the wall dry, improves how well the paint grips. Dusting with a dry cloth or broom for ceilings and corners also helps.
It’s a small prep step that most people are tempted to skip, but it directly affects how smooth and durable your final paint job will be.
