Yea, that was my project yesterday. The plastic drain hoses just slip into a bracket under the side panels. Pull them out carefully, you may get a gusher. I found it easier to ream out the clog with a wire from the bottom. In my case, it was difficult to push the tube back into the bracket, so I beveled down the edge a bit and with a little silicone grease, it went back in fairly easily. Some people discourage using compressed air since you might blow out the drain hose and splatter nasty stuff all over under the panel.

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'96 850 and '83 244 DL both at about 200K; gone but not forgotten '81 245 and '64 Amazon