I read that prunes and oranges are high in salicylates. would that mean orange juice & prune juice can help think my blood and possibly prevent clots?

Careful, Assumptions: Possibly, but compounds, e.g. Salicylates, of very similar structure sometimes have very different biologic responses, thus the crucial importance of clinical trials to verify pros & cons of response. Blood viscosity is mostly due to rbc surface proteins; blood viscosity (“thinning”) becomes low if anemic, not good. This is quite different from anti-clotting; despite commonly promoted rhetoric.

See below: Salicylates are aspirin-like substances that block vitamin k absorption & reduce platelet cell aggregation (i.e. Prevent clots). Fruits high in salicylates include raisins/ prunes/cherries/cranberries/blueberries/ grapes/oranges/strawberries. So these fruits may well help prevent blood clots, but if you're at risk for clots (as in smoker on bc pills or hx of dvt) may need medical intervention.