Can fuel injectors be cleaned by a professional shop and reused? Or best just to toss them and put in new ones? Car is a 1991 300CE with 143m. I only have records back to 87m, so they might be original to the car. Can anyone suggest a shop in the Los Angeles area if cleaning is a possibility?

Thanks,

glenmore
1991 300CE
2000 C280
1990 LS400