Best way to clean focus screen???

[cherryrig]

I got my Bronica the other day but the focus screen looks a bit dirty. I was wondering what was the best way to get rid of the black little marks on the screen.

Someone said wet wipes???

Thanks

(and I'll stop with all the Bronica questions but Google never gives me anything good )

 

[joxby]

little black marks ?

Check the light seals, I know its not as old a camera as my EC, but in't olden days the foam light seals were made from an oil derivative, and after 30 years or so they start to perish and break down.
It turns to a gooey tar, bits fall off, you see them on the focus screen and wipe them off, they leave black marks.
I threw my screen in with the dishes + mild detergent, it needed detergent to shift the tar....gently though.

 

[cherryrig]

The light seals are find it's just when I look through the finder I can see marks on the focus screen. Prob just scratchs.