Clean them up with 2" rubber caps from Home Depot. For us Northern people snow and ice and salt finds its way everywhere and there is no need to give it a cave to rest in all winter.
These were $11.00 plus tax for 4 of them.
Insert them this way to keep the look cleaner and make it easy to pull them when access is needed.
There is a guy selling plastic versions of this on eBay for I think $15 plus shipping. Save money...buy local!