The Cash Cow strategy has been around for many years. I originally bought it from a web site years ago (I believe I paid $97 for it, the web site is no longer around). The good news is that this strategy is now free for the taking
here. I have no affiliation with anyone in conjunction with this review.
The Cash Cow is a manual trade once a day (maybe) strategy using the GBPUSD pair. There are a series of rules before a trade can even be considered and there is quite a bit of math to calculate everything. Once you get used to it, it should take no more than about 5-10 minutes a day. This is a low attention strategy, you set it up and walk away.
The strategy is not a scalper, nor a grid trader, also does not employ Martingale
money management 
. It has a very good risk:reward (1:1.4, 60 pips risked for a maximum of 100 pips gain). I started this review trading at 2% risk (equity * 0.02 / 60 pips / 100 [if a standard lot account, eg: 0.10 = 10,000 units]).
This is the third time I have started trading this strategy. The other two times, I stopped because I thought I could do way better (in terms of return) with an EA. Now I have learned that this may be true in the
short 
to medium term but not in the long term.
I am not sure that the win
rate 
will be, we will just have to wait and see.
Link:
http://www.myfxbook.com/members/rsmereka/cash-cow-gbpusd/172955
Rick