Waxed canvas needs very little care or cleaning. Over time, you may want to refresh your item by re-waxing it, which will make it look and feel new. This is not difficult to do and is the best way to ensure that your item will last a lifetime. At Cottonwood, we use Martexin Original Wax Canvas and you can purchase a tin of their Wax Compound here. https://fairfieldfabrics.3dcartstores.com/Martexin-Orignal-Wax-Refinishing-Compound_p_99.html
To re-wax, use a soft bristle brush or your fingers to spread wax evenly across the surface of your item. Use a dry iron (low setting) or a hairdryer to melt the wax into the fabric, smoothing it as you go. If you use an iron, be careful to put it on the lowest setting required to melt the wax and do not rub it across the surface. Just touch it to the wax and remove it promptly. Also, be sure to clean the iron afterward, as it may stain other items. We find it helpful to use a brush to spread the wax evenly, as it melts into the fabric.
Your item will have a waxy feel immediately after waxing, but it will dissipate quickly.
At Cottonwood, we give a light re-waxing to all items after production. This ensures that all stitched seams are waxed for added strength and durability and also cleans up any lines or crease marks resulting from the production of the item.