I have a Weaver v9-IIw 3-9 scope with front adjustable objective. It's a bit dirty under the front glass. Looks like a smudge of some sort.

I've tried to find info on how to remove the front glass but no luck so far. There are some threaded rings inside that I'm guess I might need to remove but not sure what tool to use or if that is in fact the right way to do it. The rings have a notch in a few places (see image) that I'm guessing a tool would lock into to loosen.

Anyone have any suggestions? Thanks.

Send it to one of the specialists who restores vintage optics.

Ironsight Inc. 918-445-2001. They're in Oklahoma. Great folks that rebuilt a German Hensoldt Wetzlar for me.

I found their sight while initially searching, but it says they no longer service the v9 model that I have.

You're in luck if it's anything like mine, I just rebuild an older Weaver S29 and it's easy.  Everything I say applies to mine and may or may not to yours.  Is it nitrogen purged? If so you'll be letting it all out.

On mine there was a little bit of soft, black sealing substance that scraped off the threads.  Next there is a threaded ring with two notches, I used 2 screwdrivers to unscrew the ring (large snap ring pliers may work), there was a fiber washer under the ring acting as a buffer btw the metal ring and the glass. I turned the scope on end and it fell out.

If you want to go the rest of the way, I unscrewed the eyepiece and was able to push the rest of the components out from the eyepiece end.  PAY ATTENTION TO THE ORDER AND ORIENTATION (flat side/curved side) of the lenses and washers.  I disassembled mine to replace the crosshairs that were gone; ( a little bit of super-glue, a few of the finest blond hairs from the nape of my daughters neck, and a black sharpie and I have new crosshairs and clean lenses.  Now I realize that I could have bought crosshair wire from ebay.

There's no way that's visible looking through the scope being its on the edge. Your pupil will be way smaller than that.

So I'd just leave it.

The circled part on the edge is the ring I think I need to unscrew not what's dirty. The lens I can't get to under the outer glass is what's dirty.

Thanks. I'm not sure if it's nitrogen purged, but I can unscrew the eyepiece so maybe not.

If it's cloudy on the inside, even if it were purged, the seal is likely broken.  If I recall there are at least 2 more lenses on the inside of the tube that would likely need cleaned as well (mine did).  Maybe you'll get lucky and only the one lens needs cleaned.  My eyepiece lens' were a bit cloudy but I was not able to disassemble the eyepiece to get between the lenses and was not going to risk breaking it.  My scope was from made from '37 to '47 on grandpa's old Remington Speedmaster pump 22 and as a younger me, I stuck my pinky down the tube to see what was in there, well duh, the crosshairs were there, for the last 50 years this has bugged me so I decided to get it fixed, but the cost and wait times were a bit unrealistic for me so I did it myself.  If you do push out the 'guts' be careful of the crosshairs.  If I recall starting at the objective lens it went... Notched Ring>Fiber Washer (FW)> Lens> Spacer>FW>Lens> FWx5>Spacer>Lens>FW>Spacer.

Take out the elevation and windage screws as well, push on the spacer or something solid, NOT the piece that holds the reticle, it's kinda bendy and not strong.  You can do some googling, chances of finding your scope torn down might be slim, but to a degree, they are all kinda the same inside (lenses etc...)

I found this place that apparently can refurbish my scope for $200.

https://www.vintagegunscopes.com/refur

Anyone have any experience with them? Might be better to just pay a bit and ensure it's clean. I don't know if it's just the glass quality (or lack of) or intentional, but this scope has a bit of yellow tinge to it. Maybe that is something that would be improved to with a proper cleaning.