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.
'73-4 Ampeg V4B, Ampeg PF350,PF115HE, PF115LF, 115 Traynor, 1962 Fender Jazz, 75 Gibson G3, '10 Squier VM Jazz, Squier CV 60's P Sonic, Squier CV 50's P blonde, Epiphone Thunderbird IV