I've never heard of these... what is their function?
I don't know how to remove the rust, but I would strongly suggest something that stops the rust from continuing. (I don't know the name of the compound, but it's supposed to change the chemistry so it stops rust in it's tracks).
They keep snow from building up and coming off in one big mess.They are pretty common here on the older roofs.A lot of new roofs have them,too..These are almost 100yrs old.New ones cost between 10-40 each !
Bead blasting would clean the surface with out eroding any more from the already badly pitted surface.
But don't know what equipment you have access to.
But some anti-corrosion surface treatment is badly in order on these or they will be no more in a few more years.
'93 Blue 5spd 230K(down for clutch and overall maintanence)
'93 White B6 swap thanks to Skeeters Keeper
'92 Aqua parts Car
'93 Turquoise 5spd 137K
'90 White LX Thanks to FB71
"Your God of repentance will not save you.
Your holy ghost will not save you.
Your God plutonium will not save you.
In fact...
...You will not be saved!"
Muriatic acid will remove remove rust...not sure the exact procedure though. Google it.
1986 Comp Prep SVO Mustang(1 of 83) Four cylinder turbo! (Think first Fox body "R" model!)
1995 F-150 Extra Cab and it was free!
1991 Festiva L, Surf Blue with A/C
1995 Jeep Cherokee 2wd 5 speed 4.0 and it was free!
1993 Aqua Festiva and it was cheap!
1994 Brake Swap and it was cheap!
1969 Ford F100 Big Block Ranger and it was free! (coming 2/12)
Electrolysis would be the fastest method (you can do them all at the same time)vbut, because they are old, they may be worth more money the way they are now.
Use household white vinegar.Very mild.Soak them until the look fairly clean and then apply a coat of POR15(available on ebay or online).It will stop the rust,is permanent and leave a paintable surface.It is also available in several finish colors.Good luck!!
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