I found the wax to be crap. It gets all clogged up and it's hard to clean off. Put the bike on a padock stand. Get a good de-greasing spray and coat the chain and sprocket. Let it soak in then use a cotton rag to get the loose stuff off. Use a tooth brush to get the stuck on crud off then us your lube of choice. Like G3o said wurth do a good product. Put it on the inside of the chain (the bit that touches the teeth) and leave for as long as possible.