Soldato
I really wouldn't worry about it. Wipe it off and oil it. Worst comes to the worst it's £15-£20 to get a new one fitted or less to do it yourself.
Changing the chain etc is fairly inexpensive. The thing that I worry more about is the chain snapping whilst riding, it can be really dangerous if your cycling on the road and you end up coming off your bike with a HGV behind you.
Also can effect gear changes, and wear out the gear cogs.
Cover in GT85. Scrub/wipe cassette. Wipe chain rings and mech's. Wipe crud off jockey wheels especially. Rinse. Soak rag in GT85 and run chain through in a similar fashion to a cleaner tool.
I've a chain cleaner tool with which I have done similar in the past, several passes, throwing away the solution once dirtied significantly. But find the method above good enough for interim cleans.
Tend to just plonk GT85 on as 'lube'. If it's clean I don't care a great deal as long as it's not bone dry.
GT85 isn't a chain lube.
I use white spirit in a chain cleaner, usually clean the cassette and chainrings at the same time a brush, as well as the jockey wheels. This seems to be where most of the dirt is held. Dry off the white spirit, then lube as necessary.
Pretty much stripped all lube/grease from bearings, jockey wheels etc
Those parts would need a strip down and re-lube down to bushings/bearings.
Has worked for me for the last 20,000 miles. The idea is to strip all the crap away, then re-lube
WHo said anything about pressure washers??