diff --git a/lib/widget.js b/lib/widget.js
index 668479d..c769524 100644
--- a/lib/widget.js
+++ b/lib/widget.js
@@ -677,7 +677,7 @@ Screen.prototype.cleanSides = function(el) {
     return pos._cleanSides = true;
   }
 
-  for (; y < yl; y++) {
+  for (y = yi; y < yl; y++) {
     for (x = pos.xi - 1; x >= 0; x--) {
       ch = this.olines[y][x];
       if (ch[0] !== first[0] || ch[1] !== first[1]) {
@@ -686,7 +686,7 @@ Screen.prototype.cleanSides = function(el) {
     }
   }
 
-  for (; y < yl; y++) {
+  for (y = yi; y < yl; y++) {
     for (x = pos.xl; x < this.width; x++) {
       ch = this.olines[y][x];
       if (ch[0] !== first[0] || ch[1] !== first[1]) {
@@ -2007,8 +2007,7 @@ outer:
 
 Box.prototype.insertLine = function(i, line) {
   //if (typeof line === 'string') line = [line];
-  // if (this.screen.cleanSides(this)) {
-  if (this._lastPos && this._lastPos.xi === 0 && this._lastPos.xl === this.screen.width) {
+  if (this.screen.cleanSides(this)) {
     i = Math.max(i, 0);
     i = Math.min(i, this._lastPos.yl - this._lastPos.yi - (this.border ? 2 : 0) - this.padding * 2);
     //this.screen.insertLine(line.length
@@ -2028,8 +2027,7 @@ Box.prototype.insertLine = function(i, line) {
 Box.prototype.deleteLine = function(i) {
   //if (typeof line === 'string') line = [line];
   var reset = true;
-  // if (this.screen.cleanSides(this)) {
-  if (this._lastPos && this._lastPos.xi === 0 && this._lastPos.xl === this.screen.width) {
+  if (this.screen.cleanSides(this)) {
     i = Math.max(i, 0);
     i = Math.min(i, this._lastPos.yl - this._lastPos.yi - (this.border ? 2 : 0) - this.padding * 2);
     //this.screen.deleteLine(line.length,
@@ -2205,8 +2203,7 @@ ScrollableBox.prototype.scroll = function(offset) {
 
   // Optimize scrolling with CSR + IL/DL.
   p = this._lastPos;
-  // if (this.childBase !== base && this.screen.cleanSides(this)) {
-  if (this.childBase !== base && p && (p.xl - p.xi) === this.screen.width) {
+  if (this.childBase !== base && this.screen.cleanSides(this)) {
     t = p.yi + (this.border ? 1 : 0) + this.padding;
     b = p.yl - (this.border ? 1 : 0) - this.padding - 1;
     d = this.childBase - base;