Look at the visible ear area during a calm routine check without inserting objects into the ear canal. Note unusual redness, discharge, smell, repeated scratching or head shaking, and contact your vet if you notice a change. Large furry ears do not need aggressive cleaning simply to look tidy. Cotton buds and unsuitable products can cause harm or push material further inside, so use only a method and product recommended for your cat. If you already have prescribed treatment, follow the instructions and ask the clinic to demonstrate if handling is difficult.
Keep a brief record of which ear is affected and when signs started. The purpose of an at-home check is to notice a problem early, not diagnose mites or infection from appearance alone. A comfortable cat should not have to tolerate repeated probing to complete a grooming routine. If treatment is prescribed, confirm which ear, how much product and how long to use it; do not reuse an old prescription for a different episode.
For product comparisons alongside this advice, see Cashmere Comb grooming set and Reusable pet-hair roller. The details below explain their sizes and uses.
Further reading: cats.org.uk; pdsa.org.uk; rspca.org.uk; bluecross.org.uk; cats.org.uk.
Cashmere Comb grooming set
Reusable pet-hair roller