Hey guys been absent for a long time but I’m back. 
  
Long story short I have a white residue after stripping paint. Will this be ok to prime over or not, if not what should I do? 
  
I used the purple stuff first then washed it with detergent, after letting it dry I noticed the residue, as you can see in the pic. So I figured I try simple green and basically the same result.  The residue comes off when I scratch it with my fingernail. The black and white parts seem to be ok its just the parts that have the beige color to them. 
  
I really need help I’ve been at this for couple of months now, and just want to start building. 
  
Any help would be great. 
  
Thanks Zee