A chain can't really be cleaned well, while it's on the bike. I used wet lubes in dusty conditions for many years, but I'd take the chain off every week and put on a clean one of the three that I used in a rotation. Using a wipperman connex link made this easy.

Last year I started using a home made dry wax lube that works great, but expecting it to last even 200 miles is unrealistic. The big advantage is does not collect dirt, the chain needs far fewer cleanings. Reapplying the lube only takes a couple of minutes. I apply a drop or two to each roller. Applying lube in a stream will use a huge amount and make a mess.

6-7 fluid ounces of naptha (white gas) to 1 ounce by weight of paraffin, plus .5 ounce of high quality oil.