What is an expedition? How long? What season and how many seasons? As far as bikes/gear is concerned, there are some eastern European countries where a guy need to be pretty self-sufficient . What is expedition gear?

There are many rides that are multi-month regardless of the location.

Laundry facilities can be an issue in Europe. The best place to find laundry facilities are the bigger campgrounds.

Defining your question would probably get you more meaningful responses.