Soap water should kill them.

Will try that I hadn't done that yet this year

Pyrethrum from Bayer will kill them. Once dried, its harmless to bees and it will break down by UV in 24 hours. It is recommended not to spray on open flowers. Soapwater didn't do a thing here. Waterblasting blew them all away but the aphids were taken back into position by ants. So if you have ants near your roses, you need to do something against those too. And I did with satisfying results. I don't like to spray but I'm not gonna have my pleasure ruined by some ******* insects that aren't much beneficiary anyway. Ladybirds are completely absent this year, and the birds ignore everything that crawls around in my roses, leaving me no other choice.

Soapy water can burn the foliage in hot weather.

Aphids are born, live and die on roses. If they get knocked off and fall onto the ground, they are very weak and have no way to get back onto the rose again so birds eat them up like candy. Bugs also enjoy an aphid meal. All you have to do is knock the aphids off the roses. They are usually at the tips where the tender, new growth is and they suck on that. A spray with water from a hose, hitting the top of the canes with your hand or using a mild spray will get rid of them. You honestly don't need to kill them just knock them off the rose plant. Sprays may kill many but they can also miss a few. And in aphids world of love, one and one makes thousands.