Lighter fluid is great for stubborn finger funk. I'm sure you'll find that it was discovered well before lighters were invented. Nitro hasn't been used for years in mass produced instruments. Your Squier is poly finished. You can safely use windex on it if you want. Warm water. Deionized water. Whatever, any mild detergent just dry well after. Then polish as desired. Modern poly coatings are extremely durable and impervious.
*1962 Jazz. '74ish Ampeg V4B, 115/210. * '75 Gibson G3. *Epi Tbird. *Squier: VM Jazz, CV 50's P. *Squier VM Jazz Assoc. *MBC 641. Squier owners club