Selenicereus Grandiflorus

Can anyone give me some advice on a Seleicereus Grandiflorus I have
acquired?   Its very battered, some is sort of corky and other bits have
gone bleached looking, I think its in a state of suspended animation.  
I've supported it on canes - it must be about 3'  tall (some bits have
fallen off), in a clay pot filled with a sandy, gravelly soil.   Any tips
on how to treat it?
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