At our LDRP unit, I do csections, functioning as a circulator. Among my responsiblilities, it is up to me to scrub patients prior to draping and surgery. We use a "kit" premade for this purpose. It contains sterile gloves, white drapes, oranges sponges, qtips and iodophor cleaning solution in a squeeze bottle.
I was taught to place 1/2 of the iodophor solution in a circular motion on the abdomen----inside to outer edges. The other 1/2 gets placed over the scrub sponges. Then, I take the q-tips, dipped in iodophor, and first start by cleaning inside the umbilicus. Then, using the oranges sponges provided, I begin thoroughly scrubbing the abdomen, starting at umbilicus and working outward, in circular motion ----never going over the same spot twice. There are 4 sponges to do this job, which are plenty. I ensure there are no "windows" --or spots I have missed, prior to completing the job. These get cleaned with a fresh sponge I save for that purpose. On "fluffy" patients, you have to be careful not to rub your arm across the abdomen at any point and you may have to have someone look on the other side to be sure you left no "windows" you did not see.
When done, you should have scrubbed her from the upper thighs to the xyphoid to be complete----including the pubic region, thoroughly. After, I use the drapes to "dab" at the scrubbed area to remove excessive skin cleanser, helping the surgical drapes better adhere to the skin, once placed by the scrub tech.
So, like I said, INSIDE, OUT, never touching same spot twice with a used sponge. It's really quite simple. But much better if someone trained in scrubbing for surgery teaches you FIRST. It helps to SEE it done, at least for me.