How do I clean the inside of my headlights on 2004 Oldsmobile Alero

We live in the desert and there is sand in my headlights . How do you take them apart to clean the inside.. there is a dirty film on the inside makes it hard to see at night

Asked by for the 2004 Oldsmobile Alero
or replace with new
Thank you both.. My husband said there is no way to get into the light itself, Unless there is a tool to open it. and you can see the sediment inside He cleaned the outside. I have a feeling we should have done an accident report when we bought it and the seals must be broke on the light . The car is a 2004 and has another year on the door.. that tells me it was in an accident. I guess replacing for new would be the best bet.Thank you again
try calling pac auto in orange co.calif. they sell cheaper aftermarket lights for like 1/2 the price.
Thank you will do ...
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you will have to take the bulbs out are you sure its not on the outside because they have kits to clean the lens