I would like to know about washes. If you paint your model with acrylics, water based paints, can you wash your model with turpintine or mineral spirits? What about terpinoid? Please give me some advice on washing armor.

I have used mineral spirits with artists oil paint to wash with no problems. I can't say for turpenoid or turpentine. It's been a while since I finished a model, but I remember using a clear coat in between just to be safe, although I am told it's not needed.

I airbrush my models with Tamiya acrylics, let the model cure (dry) for a few days and then give a few coats of Future. I let the Future cure for a few days before doing the wash.
For a wash I've used oil paints mixed with odorless mineral spirits (generic brand from Home Depot).
The way I wash- I mainly wet the brush with the wash and touch it to the model at the recesses, letting capillary action draw the wash into the recesses and joints. The wash does not interfere with the paint or the Future.
The Future is great for setting decals as well. My decals have never looked better after I started using Future. I also use Walthers Solvaset to set the decals. It CAN ruin the Future and paint if you 'fuss' with the decal after applying Solvaset. I have found the if I apply the decal, draw off excess water, then apply some Solvaset and allow it to dry , the solvaset will not mar the paint job.
For dust and grime I used pastel chalk either applied straight, or mixed with a little water and applied.

Anyway, my two cents on washes, and some other thoughts

Peter