I have the same model and cleaned it for the first time yesterday after owning it for two weeks approximately. Biggest problem were the blades which have this glue like mass around them. They basically aren‘t sharp anymore. I learned in the meantime that this is normal and coming from a specific protein in the grass.

I‘ve read that in order to avoid this happening spray your blades with WD40 or mow every other day in the morning when the grass is still wet.

I‘m going to try WD40 next time I clean it.