Still waiting for limonene to finally replace white spirits in every hardware store. We have tons and tons of citrus peels from the juicing industry, i'd bet there's enough to produce a decent amount of more eco-friendly alternative solvents to white spirits, even if they're sold at a premium. A lot of people would be fine paying a bit more, if it means it's non-carcinogenic and smells like freaking lemons and not poison.