Some people clean cartos but you dont necessarily have to. Their made to be disposible. I use the Ressurectors and dont clean them. I get about 2-3 weeks with one Ressurector before the airflow is not as good and then I just throw it out and use a new one. Make sure you fill them correctly bc that will help make them last longer. I recommend using a syringe bc its quick and easy but the condom method and dripping in the top work as well. If youd like detailed instructions on how to fill with a syringe I can post it if youd like.
I would just use the carto and when your not happy with the flavor anymore or it starts to become clogged, then throw it out and start with a fresh one. You could try cleaning them though, thats up to you. Ive noticed though that sometimes when you clean cartos, they dont wick as well after a cleaning. Thats why I like just using a new one. I figure if you can even get 1 week use out of one carto then they are well worth the price.
Oh and I wouldnt recommend using 1.5ohm DCs on an eGo. Using them puts a LOT of stress on the mosfet and will eventually fry it, rendering it useless. Their not made to handle that low of a resistance. While a carto might say that it is 1.5ohm. Their not all necessarily 1.5. Cartos normally are +/- .2ohms than what they say they are. Thats why I would not use 1.5ohms. Their already too low and if you use one that happens to be closer to 1.2ohms, then your almost guaranteed to fry the mosfet, and turn your eGo into a paerweight. What ohm Boges are you using? If you want to use LR on your eGo, Id use the 2.0ohm ones. While even they can still potentially fry the mosfet, its a LOT less of a chance of that happening. Many people use 2.0ohm Boges on their eGos with no problems at all.
The SR cartos dont put as much stress on the eGo, but if you really like using LRs Id maybe consider getting a 3.7V device, like a Riva, kGo, or E-Power. They give a slightly warmer vaper and alittle more TH than an eGo and handle LRs much better.
I have an E-Power and love it. It handles any atty/carto I throw at it and a battery lasts a day to a day and a half for me using the "Ressurector" cartos, which are 1.7ohm LR. They also make a 1.5ohm LR carto that is designed specifically for the E-Power that holds over 5ml of juice if you like DCs. Plus E-Power batteries cost $4 compared to eGo batteries that are $14-20, and they last alot longer before they need to be replaced.
If your going to continue using low ohm cartos on your eGo, I would use a multimeter and check the resistance of every carto you use. That way you can really see what ohm the carto is at. That will help you catch a carto that is lower than its supposed to be, and could potentially save you from frying your eGo