How can I effectively eliminate persistent grease stains from a sweatshirt that has undergone washing and ironing with brown paper?

Additional Tips:

Always test treatments on a small, inconspicuous area to ensure they won’t damage the fabric.

Be patient and repeat the process as needed. Some stains require multiple treatments.

Treat stains promptly for better removal results.

Use preventative measures, like wearing an apron when dealing with greasy substances, to avoid future stains.

Remember that different fabrics may react differently to cleaning methods, so always adhere to care instructions to prevent unintended damage. Though grease stains can be persistent, diligent efforts and these steps can often restore your sweatshirt to its original condition.