[NTG-context] How to remove \jobname-mpgraph.dddd?

I have a silly question - how do I remove mpgraph files now that ctxtools is gone and "context --purge" doesn't know about them? "context" doesn't need to know about mpgraph files as long as MKIV is not generating them, but if there is no mkii-only --purge alternative ... I have fifty files \jobname-mpgraph.4000 ... \jobname-mpgraph.3951 and even though I can use "rm", --purge would be a lot more convenient. Mojca