FAQs & Troubleshooting FAQ Search Results Innov-is 4750D Not your product? Search by FAQ ID number Search Back to FAQs & Troubleshooting. 3 Results 1.faqh00000095_002 How to clean the bobbin case(pink marking or no marking) when using a prewound bobbin. 2.faqh00000095_001 How do I use a prewound bobbin? 3.faqh00000095_000 How do I clean the race? FAQs & Troubleshooting