I don't use a Scottoiler, but tend to get the feeling when the chain needs a good scrub.
Oiled or not, if you ride during winter the chain will pick up shite from the road, it's unavoidable.
Just a case of common sense.
I actually use WD40 as a cleaner with a brush, then Wurth chain lube afterwards.
Done me alright for 30 years riding, so i'll stick with a proven method.