cowl drains

No easy way bob. You can remove your heater box on the right side, and fresh air vent box on the left side, and reach up through the holes going into the cowl and try to dig what you can out.

However the drain holes in the sides of the cowl are probably also plugged. These cant be seen as the fenders overlap them. You may be able to unbolt the fenders at the top, and carefully move them away from the cowl a few inches to get in there at the cowl drains. Maybe use a modified coat hanger with the end shaped like a hook to pull leaves and trash out.

Once you get most of the blockages loose and removed, id suggest parking the car in your driveway, and flooding the outside center cowl vent with water from your garden hose to flush the remainder out. With the fenders pulled away you can verify that all the junk is coming out, and gone.

Now you will have to clean out the lower fenders as everything from the cowl will likely have accumulated there. I am assuming that you have twigs, leaves, dirt, mulch etc in the cowl area that you are trying to remove.

There is no real easy way, unless you want to cut access holes in the cowl on the engine compartment side , dig the junk out, then use rubber plugs or plastic caplugs to cover them up.

Hope this helps
Matt