How do you remove the default Bootstrap 3 carousel control background gradients?

Question

I'm pretty sure this is the code I need to modify, but for some reason I can't get the gradients to disappear in IE. I want them completely gone!

.carousel-control {
text-shadow: none;
opacity: 1;
filter: alpha(opacity=100)
}
.carousel-control.left {
background-image: -webkit-gradient(linear, 0 top, 100% top, from(rgba(0,0,0,0.5)), to(rgba(0,0,0,0.0001)));
background-image: -webkit-linear-gradient(left, color-stop(rgba(0,0,0,0.5) 0), color-stop(rgba(0,0,0,0.0001) 100%));
background-image: -moz-linear-gradient(left, rgba(0,0,0,0.5) 0, rgba(0,0,0,0.0001) 100%);
background-image: linear-gradient(to right, rgba(0,0,0,0.5) 0, rgba(0,0,0,0.0001) 100%);
background-repeat: repeat-x;
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#80000000', endColorstr='#00000000', GradientType=1)
}
.carousel-control.right {
background-image: -webkit-gradient(linear, 0 top, 100% top, from(rgba(0,0,0,0.0001)), to(rgba(0,0,0,0.5)));
background-image: -webkit-linear-gradient(left, color-stop(rgba(0,0,0,0.0001) 0), color-stop(rgba(0,0,0,0.5) 100%));
background-image: -moz-linear-gradient(left, rgba(0,0,0,0.0001) 0, rgba(0,0,0,0.5) 100%);
background-image: linear-gradient(to right, rgba(0,0,0,0.0001) 0, rgba(0,0,0,0.5) 100%);
background-repeat: repeat-x;
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#00000000', endColorstr='#80000000', GradientType=1)
}
.carousel-control:hover, .carousel-control:focus {
opacity: 1;
filter: alpha(opacity=100)
}

Answer 1

.carousel-control.left, .carousel-control.right {
    background-image: none
}

Answer 2

IE has a weird filter and this worked when trying to fix it in IE9 (should work for all):

.carousel-control.left, .carousel-control.right{ 
    background: none !important;
    filter: progid:none !important;>
}

Answer 3

I notice that this will also have this annoying dotted line box when you click it unless you add this:

All in all, this makes the buttons beautiful:

.carousel-control.left, .carousel-control.right {
  background: none !important;
  filter: progid: none !important;
  outline: 0;
 }
.carousel .carousel-control {
  visibility: hidden;
}
.carousel:hover .carousel-control {
  visibility: visible;
}

Answer 4

There is specialized mixin for resetting IE gradient (Bootstrap 3).

SASS:

.carousel-control {
  &.left, &.right {
    background-image: none;
    @include reset-filter();
  }
}

Answer 5

.carousel-control {
        opacity:100;
    }

worked for me. Hope this can help someone.