How can I remove streaks imbeded into the mirror that is old

If your mirror is very old, it is probably a lead mirror. The streaks are actually not imbedded in the mirror, they are the effect of the lead coming off of the back of the glass. There are lots that they make to resurface mirrors (modern techniques without lead). I’m just not sure if it would work over the lead or not. You could probably call someplace in your area that refinishes antiques. Or call the company that makes the kit that you choose and ask them.

Fill a spray bottle with a 50/50 mixture of water and denatured alcohol. This diluted solution is completely safe for the mirror, but is much more effective than commercial products in cutting through years of residue and buildup.Hold the spray bottle six inches away from the mirror surface, and spray a thick coating of the cleaning solution over the entire mirror. Let sit for two minutes.Scrub the mirror clean with a lint-free cleaning cloth. To remove the majority of residue you will need to apply extra elbow grease, but this will pay off quickly as you notice the clear, original quality of the mirror begin to emerge.Repeat until the mirror has been fully restored. Spray a coating of the cleaning mixture over the mirror every few minutes to keep the residue soft and easily removed.

Embrace the age of your mirror. The back of your mirror is coated with silver. Over time the silver becomes damaged by moisture and solvents used to clean the glass. It will never be a proper looking glass but a testament to all those to gazed into it before you.