A little bit of wax build up is normal, you can try & limit this with the amount of wax you apply. The wax-off product that should do the trick when applied to the microfiber towel and running the chain through the saturated towel. If there is still build-up on the chain and bike, personally we like to use a stiff nylon brush to clean pulleys or even a brass brush to clean the cassette. The warmer the wax the easier it is to clean.
