mine were black originally, I put them in dishwasher every 2-3 months - just make sure to take them out and dry them well quickly - do not leave in the dishwasher in the moist condition - to prevent rust; in between those 2-3 months I just scrub them lightly with green or blue scrub pad when I clean the stove top surface

We have the wolf 36" open burner range top with charbroiler. I had a Wolf repairman out for an oven problem--he said that the best way to clean the black enamel burner pan is (as djlankpl said) to use Easy-Off non-fume oven cleaner. For regular cleaning I usually use a non-abrasive scrubber with soapy water and finish with a microfiber cloth. I have also developed a tolerance for a less-than-perfect look. I rarely clean the grates as they sort of self-clean with enough heat.

The confusion is in the word seasoning in this application. OK it's not a wok or a cast iron pan that needs to be properly seasoned but here's Bluestar's recommendation: This is from the BS web site..."Your ring grates, top grates and burner heads may darken over time with use. This is normal. TIP: To prevent your burners from darkening at an uneven rate, rotate the ring grate and top grates between more and less active burners. BURNER CLEANING Ring Grates and Top Grates TIP: Clean spills as soon as possible to prevent sticking and build up.  When burner is cool, remove the ring grate, top grate and center filler grate (30” models only).  Wash in hot, soapy water. Rinse well and dry thoroughly to prevent rusting.  Handle gently to prevent nicks/chips, which can lead to rusting TIP: If you have a nick or chip you can season the area to prevent rusting. Nicks or chips are not covered under warranty.  Put corn oil or other high smoke point oil on a paper towel and rub onto rusted area.  Wipe away excess oil and replace the part on the range. Do not submerge the burner grates in water for extended periods of time. Prolonged exposure to moisture may cause rusting.  For heavy soiling, use a commercially available oven cleaner. Follow the cleaner manufacturer’s instructions. Make sure the cleaning chemicals do not contact any stainless steel or painted surface on your appliance.  Reinstall grates in cooktop and make sure they are seated properly, and do not move unsteadily from side to side". So, BS says it's OK to hand wash or DW and they also use the word "season" so this is maybe why it's a bit confusing to some. It's not seasoning in the traditional sense but oil on these grates will keep them looking good over the life of the grates, IMHO. This isn't that different from keeping your backyard BBQ grates from rusting, same principle.... Here's a tutorial for cleaning, this is just informational.... cleaning your bluestar grates

You'll probably get a response if you post this question in the appliance section. There is a huge Bluestar following there. I have one, I would think if you oiled it with some vegetable oil it would work. Then put the burner on high with the vent fan on. But, definitely post your question there before you try that.