I never used liquid lam, but one thing that comes to mind - if you do a large batch, you need to have enough space for all that stuff to lay around and dry. Not sure if it can be hung while drying - may need lots of table space. And how long does it have to dry before you can handle it? And so, if you have to have prints off the printer hanging around outgassing for 12-24 hours, and then prints laying around drying for another 12-24 after laminating, that's a real concern.
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The best practice does depend on the application, for example a canvas would be treated differently to a truck curtain side. For more delicate applications like canvas, photographic and other inkjet prints, we would recommend using a soft cloth or sponge dipped in a solution of warm water and mild detergent. It is best to avoid any chemicals with Alcohol or alcohol based. Cleaning products for babies give good results due to their mild nature.
Truck curtain sides should be frequently cleaned otherwise dirt will build up. There is a temptation to use abrasive scrubbing or solutions containing alcohol to remove the dirt which could compromise the Liquid Lamination coating and create a porous surface allowing dirt to build up easier afterwards.