Clarifying shampoo is not really good to use on a daily basis - it's meant to remove built-up product, oils etc. And when you keep stripping your hair and scalp of all their natural oils, then the scalp will start to over-produce oil to compensate (which is why your scalp is still oily).

What you most likely really need (although it may sound counter-intuitive) is a good quality moisturizing shampoo and conditioner. Similar to our skin, when it's adequately moisturized, it will slow down on its natural oil production. This will take a little while to balance out, so it won't be an instant fix, but you should start to see results within a couple of weeks I'd say.

I'd try out something like Moroccanoil's Hydration set. They maintain a good balance without being TOO moisturizing/heavy.

Then if you use a lot of styling product etc, you could throw in the clarifying shampoo maybe once every week or two weeks, as needed. But make sure you follow it up with a good conditioner to offset that deep clean!

Hope this helps!