Or replace the allen bolts with stainless items. Those chrome steel caps will rust without regular wipe down type cleaning, and will retain moisture underneath, causing the stock chrome allen bolts to just rust more.
In the U.S. allensfasteners.com (less expensive) and totallystainless.com (minimums and more expensive but larger selection of stainless items) are a couple of good sources.
I have used bolt depot in the past, quick shipping
