what to use on concrete patio to remove rust stains from metal patio furniture?

[bigw]

can anyone tell me what to use on a concrete patio to remove rust stains from metal patio furniture? Should i use a chlorine bleach or what? I have a 4000,psi 4gpm cold water pw and a 20'' surface cleaner if this helps with your decision as to what chemical i should use.

[bigw]

wow thanks for all the responses :laugh:

[Happy Frog]

Oxalic acid. (F-8)
You can buy it from Bob at http://www.pressuretek.com
Pressure wash first if needed then apply F-8 with sprayer and rince with water after 10 min dwell time.

[Don M.]

oxalic is great,just dont get a face full from the wind blowing it back...:)

[jeffex]

muriatic acid available at home depot in garden shop. be careful as it is acid . wear a mask and gloves as the fumes can choke you . pour it on the rust spot. only a small amount is needed and it eats the rust and etches the concrete. then you can powerwash the patio to look even www.deckdoctorpressurewashing.com

[FCPWLLC]

Third for the Oxalic. Be sure to do entire surface as toy will have very clean areas if done sporadically.