Looks like it is leaking from the seals, what usually happens is a build up of moisture inside causes corrosion on the rack bar which damages the seals, unrelated to the wrong fluid untill sometimes switching from red to the thinner green fluid late in the cars life shows up an already damaged seal.
The frothing in the reservoir could be that its just low or the filter inside has broken off.
I would try some new red fluid together with your stop leak treatment but I'm not to sure how effective they are, it might work but sadly I think you will be needing a new rack.
If you do be wary of companies offering to refurb you rack for a low price as often once you send then your rack they will see the corrosion on the bar and say it cant be fixed which will leave you stuck, chose somewhere that will send you a rack and you then send them one back.
You could even get a used rack but get the seller to snip the metal clips off and pull back the gaitors to check for corrosion on the bar and leaks.
Last edited by JON156VELOCE; 3 Days Ago at 16:13.