I can honestly say, I did the blue flame treatment from a reputable shop recommended in fnf. Sierra glow. Mr Chong explained every detail and step. Very knowledgeable and helpful.

From personal experience after 5 years of treatment, I'd say it's worth it. Expensive. At that time me Chong charges around 2k++ but include the windscreen treatment and all around glass treatment.

I will consider it again but I have not been updated on the price nor I've gotten a better car to do it.