Pothos is great. Can even withstand lower humidity levels as for Veiled. Soil needs to be replaced if you have the white nitrate balls in it. Other than that I do believe (and I might be alone in this forum) that once in a while they might swallow some soul without dying. Proper Lighting is more important after all.
Yes. Should wash the leaves off to remove pesticides and sprayed fertilizers. Covering the soil with rocks mitigates any possible issues with ingesting soil, fertilizer, perlite etc.