Does anybody know how to clear old tweets off tweetdeck for android?

I have tweetdeck on my notebook and it only displays the last 99, but the one on my phone shows them all and apparently keeps them forever, I don't want 6 months worth of timeline tweets on my phone!

I've not noticed it showing all my tweets. It loads more if you scroll to the bottom of what it does store but I've not noticed it store more than the last 12 hours or so. You could go into the phone settings, find Manage Apps and clear the cache in Tweetdeck, though.