How to make a massive purge of courses in cache?

Hello the community,

I rode a lot of course all around the neiborhood.

now I have a lot of purple line. it seem to be the course in cache.

last week I did a big course of 115km and the map has a big difficulties to refresh.

I'm pretty sure the cache is full and this is the cause of the trouble.

I'm wondering If someone has a tips to make the cleaning of the entire cache in a single way?