Here's an eye-opener from "big ag" applications.
Having equipment dedicated to organic materials is obviously preferred.
But this is the 'real world' and there is no reason not to use good functional equipment IF it can be cleaned well enough.
Large scale farmers and spray applicators apply organic materials to organic fields immediately after using conventional materials all the time.
Just think about trying to clean an airblast orchard sprayer or Ag Cat spray plane well enough before doing an organic application.
Last thing in the tank was a blend of Roundup and a couple of other herbicides. Yikes!
Not as bad as it sounds because they have to clean & rinse completely every time they switch any materials, conventional or organic.
The key thing is a product called Neutrasol or similar.
Every certifier I know will accept a cleaning procedure like this:
1> flush & rinse previous material
2> fill with Neutrasol, circulate, spray thru all hoses, nozzles, etc
3> then triple rinse, running thru the whole system each time
Obviously best done when the previous material is still fresh and liquid as opposed to any dried on residue.
Not sure of the ingredients in Neutrasol or similar neutralizing rinse agents, never researched that one.
Any time you can go from spraying herbicide to spraying insecticide without any burning from residual herbicide, you know the neutralizer did it's job.
Probably a bit shocking to think of an airplane spraying Roundup before lunch and organic legal spray like Aza-Direct or fish fert after lunch, but that's real life.
Not enough organic business to keep a plane dedicated to it. Same with big row crop sprayers and orchard blasters, many are shared use.
Personally, I'm not 'defending' such sharing, just relating some real world experience.
Myself, I would like to see all dedicated equipment in spite of the effectiveness of neutralizers.
If it makes you feel better, the organic inspectors look at cleaning procedures and records very closely, sometimes performing suprise inspections at changeover or cleaning time.
So, after all that, what about your garden sprayer?
Try a farm fert & chem dealer for a bit of Neutrasol or the equivalent, and "convert" that little death spray machine into a good organic tool. 
Cheers,
Dave
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Does anyone have any suggestions as to how I can sanitize it for organic use, or is it time to have a ceremony with it, and burn it in the backyard 
I hope to catch rain water in the future but am not there yet.