Hello! Been thinking of doing this too. I'm surprised you haven't gotten a response. However every time I see an IA on the street they all have the stock halogen bulbs. Wish we all had the Daytime LED headlamps in the 2019 Toyota IA models. Anyway, I'm thinking of buying these RENO H4 LED Headlight Bulb,9003/HB2 12000LM 6000K Xenon White Fanless Plug and Play Conversion Kit Waterproof Halogen Replacement,Pack of 2 Amazon.com from Amazon. They're cheap and look decent with decent reviews. I'll update if I end up doing that. For your second question; you can buy "L.A. Totally Awesome All-purpose cleaner" at a dollar tree for a buck 25. Spray that sucker on your lamps and wipe off and it'll take that grime right off the surface of your headlight. Hope that helps!