IMO its better to give a normal bath then to use the baby wipes, powder, etc. Its not that difficult to give a cat a bath. You get them much cleaner then just doing "touch up". Here's the basics:
If you don't think you do this yourself, get another person to help - one hold the cat, one wash.
1. Clip ALL cat's nails before you start. Clean eyes, ears and use a warm washcloth to wipe the face.
2. Have a rubber mat or towel on the bottom of the tub for security.
3. Fill tub a few inches deep - no deeper then the belly of the cat. Make the water medium warm - a little on the warmer side cause you don't want the water to cool down too fast.
4. Use the washcloth to wet the cat down from neck down. Never pour water over a cat - it scares them too much.
5. Put a little shampoo down the back of the cat and work it in on back, sides, legs, neck, tail.
After you wash the cat, then rinse, rinse, and rinse again. Use your hands or washcloth. Don't spray the cat with water. Get the soap out.
Have 2 towels ready to use - initial one will be pretty wet. Wring the cat out by squeezing as much water off the fur and down the legs. Wrap the cat in the towel and start rubbing dry.
If you have a longhair, be sure to COMB out all tangles/knots before you wet the cat - a wet knot is impossible to get out. Shorthairs can more/less air dry in a closed room (no window open, no fan on). Longhairs have to be blow dried and combed or their fur will tangle.
Cats of any age can be washed. I've never had a cat I could not wash - kitten to adult. Sure they don't like it much, but with patient and 2 people it can be done. Its better to start young, but you still can wash them.