Electron retracts on two models faultless. wipe over occasionally with cotton bud. Fly off grass. Nothing else to fly off although at present its dirt.

From Electron manual
Electron retracts has designed very compact systems for need a low maintenance. The spindle system are made in auto lubricate materials, and all “delicate” parts are very protected by the high strength 7075 aluminium black main body.
Is advisable keep the spindle clean and lubricated, specially if your plane flies on unpaved runways.