In the first three months since I owned my weber genesis gas grill it worked perfectly. Now every time I grill where there is grease drippage from the meat it sets the whole meat on fire. Can this be fixed or do I just need a new grill. Oh a side note have never cleaned my grill besides the grill surface. Maybe a good cleaning will help? And like I said it just started to catch my food on fire it cooked everything perfectly.

I have a Weber grill. It is my second one; the first one caught fire and so I used a fire extinguisher on it. Since it was covered with a layer of white chemical powder, I got a new one. Today, it happened again, but the grill is pretty new. Can I just replace the grill and flavorizer bars, scrub the rest and start grilling again? Or will those chemicals make the food unsafe or taste bad no matter how I clean it?