If you are unable to take produce bags to a plastic bag drop-off location, place them in the garbage.  This is true for pre-washed salad bags as well.  

Throw Away Pre-Washed Salad Bags

Pre-washed salad comes in plastic bags that have an extra layer to protect the bags’ contents. Packaging for salad cannot be recycled because of this extra layer, so throw it away.

Reusable Produce Bags

Shopping with reusable produce bags reduces your plastic waste in the same way as reusable shopping totes. This Good Housekeeping article provides an overview of great reusable produce bag products.