With me also a pluggable palm rest has been doing. Keeping these used longer and this abmacht sometime Wirde you notice small scratches on the surface of the keyboard. This looked ugly, so I got the rest in continuous use.
To clean the keys can be levered out, the F-key row is slightly narrower than the other UDN CTRL to CTRL is a slight bow recognizable. This makes the space key and a bit wider so unverfehlbar.
All in all: simplicity, durable, functional and affordable.