I have a Thermador island hood and I have been experiencing problems with the light bulbs, because they are going off very often, I have been replacing the bulbs but it seems that is not a matter of the bulbs the issue seems to be the contact between the bulbs and the contact, so I took them off and clean the contacts but it last just a couple off days, does anyone knows abot a ggod cleaner for thecontacts that could really swipe off all the product from the cooking residues that sticks to the contact ?